Nucleophilic behaviour of DBU and DBN in reactions with 4-halo-3,5-dimethyl-1-nitro-1H-pyrazoles
摘要:
Addition of 3 equivalents of DBU or DBN to a solution of 4-halo-3,5-dimethyl-1-nitro-1H-pyrazole (5a-c) in acetonitrile affords the unexpected products 6a-c and 7a-c in fair to good yields. A reaction mechanism is proposed involving an elimination of HNO2 giving a diazafulvene intermediate 8 followed by the addition of a second molecule of DBU or DBN to 8.
Lammers, H.; Vollinga, R.; Zandbergen, P., Journal of Heterocyclic Chemistry, 1995, vol. 32, # 3, p. 747 - 750
作者:Lammers, H.、Vollinga, R.、Zandbergen, P.、Cohen-Fernandes, P.、Habraken, C. L.
DOI:——
日期:——
KETARI, R.;FOUCAUD, A., SYNTHESIS, BRD, 1982, N 10, 844-846
作者:KETARI, R.、FOUCAUD, A.
DOI:——
日期:——
Synthesis of 4-Bromo-1-nitropyrazoles and 1-Nitrobenzotriazoles (<i>N</i>-Nitroazoles)
作者:R. Ketari、A. Foucaud
DOI:10.1055/s-1982-29967
日期:——
Nucleophilic behaviour of DBU and DBN in reactions with 4-halo-3,5-dimethyl-1-nitro-1H-pyrazoles
作者:Hendrik Lammers、Pauline Cohen-Fernandes、Clarisse L Habraken
DOI:10.1016/s0040-4020(01)80801-2
日期:1994.1
Addition of 3 equivalents of DBU or DBN to a solution of 4-halo-3,5-dimethyl-1-nitro-1H-pyrazole (5a-c) in acetonitrile affords the unexpected products 6a-c and 7a-c in fair to good yields. A reaction mechanism is proposed involving an elimination of HNO2 giving a diazafulvene intermediate 8 followed by the addition of a second molecule of DBU or DBN to 8.